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Q: Is there a way to use Outlook with webmail, such as Mail.com?
A: Two ways

1) Pay for their "premium" service. Once you do, they'll give you the SMTP and POP3 addresses to their server, and your special login.

2) Use a POP3 emulator such as Freepops. You'll need to consult their homepage on configuration. I've used it and it DOES work, and often updated. Freepops is free, as the name suggests.